FILE NO. SM-CTV-O-142 COLOR TELEVISION SERVICE MANUAL MODEL NO. 25D26MA/ 25D19MA/ PF25D19MA/ 29D18MA/ PF29D18MA/ 29D99MA/ PF29D99MA/ 34D18MA/ PF34D8MA CHASSIS NO. CH-10DR Please read this manual carefully before service.
TABLE OF CONTENTS SAFETY INSTRUCTIONS ........................................................................................ 1 ADJUSTMENTS ....................................................................................................... 4 SYSTEM BLOCK DIAGRAMS AND ICS................................................................... 13 SERVICE DATA ....................................................................................................... 17 REPLACEMENT OF PARTS........................
SERVICE MANUAL SAFETY INSTRUCTIONS AND MAINTENANCE WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAUTION”AND “PRODUCT SAFETY NOTICE”INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the TV is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage. The maximum EHT voltage permissible in any operating circumstances must not exceed the rated value.
SERVICE MANUAL avoid electronic gun magnetized and decrement in convergence of the CRT. 6. When remounting the TV chassis, ensure that all guard devices, such as nonmetal control buttons, switch, insulating sleeve, shielding cover, isolating resistors and capacitors, are installed on the original place. 7. Replace blown fuses within the TV with the fuse specified in the parts list. 8. When replacing wires or components to terminals or tags, wind the leads around the terminal before soldering.
SERVICE MANUAL strong enough to cause an electric shock. Extreme caution should be exercised when working on the TV with the back removed. This is an international hazard symbol, telling you that the components identified by the symbol have special safety-related characteristics. FDA This symbol tells you that the critical components identified by the FDA marking have special safety-related characteristics.
SERVICE MANUAL ADJUSTMENTS Set-up Adjustments The following adjustments should be made when a complete realignment is required or a new CRT is installed. Perform the adjustments in order as follows. 1. Colour purity 2. Convergence 3. White Balance Note: The purity/convergence magnet assembly and rubber wedges need mechanical positioning. Refer to Fig. 1, 2. 1. Colour Purity Adjustment Note: Before attempting any purity adjustment, the TV should be operated for at least 15 minutes.
SERVICE MANUAL Fig. 2 2. Convergence Adjustment Note: Before attempting any convergence adjustment, the TV should be operated for at least 15 minutes. Center convergence adjustment 1) Receive the cross hatch pattern. 2) Set the brightness and contrast properly. 3) Adjust two tabs of the 4-pole magnet to change the angle between them and red and blue vertical lines are superimposed on the center area of the screen.
SERVICE MANUAL BLU Red Red/BLU GRN BLU Red/BLU Red GRN 4-pole Magnet Movement 6-pole Magnet Movement Center Convergence by Convergence Magnets Incline the Yoke Up (or Down) Incline the Yoke Right (or Left) Circumference Convergence by DEF Yoke Fig.
SERVICE MANUAL Circuit Adjustments 1. General Description All adjustments are thoroughly checked and corrected before the TV outgoing. Therefore the TV should operate normally and deliver proper colour pictures upon installation. However, several minor adjustments may be required depending on the particular location where the TV is operated. This TV is shipped completely in carton. Carefully take out the TV from the carton and remove all packing materials.
SERVICE MANUAL 5. Focus Adjustment 1) Use the remote control to set the contrast to maximum and the brightness, chroma to medium. 2) Set H. V. lines near center of Philips pattern to thinnest with the FCB on the FBT. After finishing adjustment, ensure that no poor focusing exists near the center or around of the frame.
SERVICE MANUAL Service Mode and Bus Data 1. To enter the D/S (Design/Service) mode a. To enter the USER SERVICE mode Set the volume to 0. Then press and hold the MUTE button on the remote control， and press the MENU button on the TV to enter the SERVICE mode. At this time, red “S” is displayed on the upper center of the screen. Use the button on the remote control to turn off the TV. In this case， the SERVICE mode is quitted. b.
SERVICE MANUAL 3. ADJUST menu Table 2 Item Adjustment Menu Description Bus Data Remarks MENU 1 AFW AFC bandwidth selection 0 For inspection only IF-FREQ IF frequency 38 For inspection only AFA Auto frequency tracing display IN For inspection only AFB Auto frequency tracing display ABOVE For inspection only AGC-TAK AGC control data 10 Adjustable FIX AUD Fixed audio amplitude output 0 VOL_MIN Volume Min. 08 For inspection only VOL_MID Volume Mid.
SERVICE MANUAL AKB Cathode voltage adjustment （1-BMCC CRT） Auto dark balance adjusting switch VSD Vertical output switch 0 For inspection only CB Color band pass filter IF selection 0 For inspection only CMB Color sub-carrier output switch Comb filter TD9181: 1-Yes，0-No 1 DS Skin tone correction control: 1-On， 0-Off 1 CL 5 For inspection only 0 For inspection only MENU 6 HCO Skin tone correction angle: 1-Skin of eastern, 0-Skin of western Horizontal compensation 1 For inspection on
SERVICE MANUAL Enter the TV to the Service mode. Select “SUB-BRIGHT” by pressing the ←/→ buttons on the remote control，and set the data to 31 by pressing the data adjustment buttons. Operate the TV for 5 minutes in the mode. d) Adjust the sub-bright data until blurry picture does not appear on the high bright area of the screen and too dim picture not on the low-bright area. e) Set the contrast and brightness to maximum or minimum, and then test normal picture alternation.
SERVICE MANUAL SYSTEM BLOCK DIAGRAMS AND KEY ICS 150-250V 50Hz Fig.
SERVICE MANUAL Block Diagram of Supply Voltage System 150-250V 50Hz Fig.
SERVICE MANUAL Fig.
SERVICE MANUAL Key ICs And Assemblies Table 3 Key ICs and Assemblies Serial No. Position No.
SERVICE MANUAL SERVICE DATA Technical Data of Key ICs Power Control Circuit TDA4605 Control IC for Switched-Mode Power Supplies Using MOS-Transistor 1.
SERVICE MANUAL Microcontroller S3P8849XZZ/CH12T1007 S3C8835/C8837/P8837/P8849 The S3C8835 microcontroller has 16K bytes of on-chip program memory and the S3C8837 has 24K bytes. Both chips have a 272-byte general-purpose internal register file. The interrupt structure has seven interrupt sources with six interrupt vectors. The CPU recognizes six interrupt priority levels.
SERVICE MANUAL · One general-purpose 8-bit timer/counters with interval timer mode (timer A) A/D Converter · Two analog input pins; 4-bit resolution · 3.125 μs conversion time (8-MHz CPU clock) Pulse Width Modulation Module · 14-bit PWM with one-channel output (push-pull type) · PWM counter and data capture input pin · Frequency: 5.859 kHz to 23.
SERVICE MANUAL 2. Block Diagram Fig.
SERVICE MANUAL 3. Pin Assignments Fig.
SERVICE MANUAL 4. Pin Descriptions Table 4 5.
SERVICE MANUAL EEPROM AT24C08 1. Features ·Data EEPROM internally organized as 1024/2048 bytes and 64/128 pages×16 bytes ·Page protection mode, flexible page-by-page hardware write protection -Additional protection EEPROM of 64/128 bits, 1 bit per data page -Protection setting for each data page by writing its protection bit -Protection management without switching WP pin ·Low power CMOS ·Vcc=2.7 to 5.
SERVICE MANUAL I2C-bus Controlled PAL/NTSC/SECAM TV Processors OM8839PS/TDA8843/44 2. General Description The various versions of the TDA884X/5X series are I2C-bus controlled single chip TV processors which are intended to be applied in PAL, NTSC, PAL/NTSC and multi-standard television receivers. These ICs are nearly pin compatible with the TDA 837× TV processors but have a higher degree of integration because the delay line (TDA4665 function) and the SECAM decoder have been intagrated.
SERVICE MANUAL Fig.13 Block Diagram OM8839 (S-DIP 56 Envelope) EW-GEOMETRY 45 ZW 3. Block Diagram 5. Refer to Table 15 about Functions and Service Data of the IC’s Pins.
SERVICE MANUAL DC-coupled Vertical Deflection and East-West Output Circuit TDA8350Q 1. Features ·East-West output stage with one single ·Few external components ·Highly efficient fully DC-coupled vertical output conversion resistor. bridge circuit ·Vertical flyback switch ·Guard circuit ·Protection against: -short-circuit of the output pins -short-circuit of the output pins to Vp ·High EMC immunity due to common mode inputs ·Temperature (thermal) protection 2.
SERVICE MANUAL TDA7057AQ 2×8W Stereo BTL Audio Output Amplifier with DC Volume Control 1. Features 2. General Description The TDA7057AQ is a stereo BTL output amplifier with DC volume control. The device is designed for use in TVs and monitors, but is also suitable for battery-fed portable recorders and radios.
SERVICE MANUAL Triple Video Output Amplifier TDA6108JF/6107Q 1. Features ·Black-Current Stabilization (BCS) circuit ·Typical bandwidth of 9.0MHz (for TDA6108JF) ·Thermal protection. or 5.5MHz (for TDA6107Q) for an output 2.
SERVICE MANUAL Dual 4-channel Analog Multiplexer/Demultiplexer HEF4052 1. Description The HEF4052 is a dual 4-channel analog multiplexer/demultiplexer with common channel select logic. Each multiplexer/demultiplexer has four independent inputs/outputs (Y0 to Y3) and a common input/output (Z). The common channel select logic includes two address inputs (A0 and A1) and an active LOW enable input (E).
SERVICE MANUAL Fig. 20 Schematic Diagram (One Switch) 3.
SERVICE MANUAL Triple 2-channel Analog Multiplexer/Demultiplexer HEF4053 selected all switches are in the high impedance OFF-state, independent of SA to SC. VDD and VSS are the supply voltage connections for the digital control inputs (SA to SC and E). The VDD to VSS range is 3 to 15V. The analog inputs/outputs (Y0, Y1 and Z) can swing between VDD as a positive limit and VEE as a negative limit. VDD-VEE may not exceed 15 V.
SERVICE MANUAL Table 8 Pinning Independent inputs/outputs Independent inputs/outputs Select inputs Enable input (active LOW) Common inputs/outputs Y0A to Y0C Y1A to Y1C SA to Sc E ZA to ZC Fig.
SERVICE MANUAL 5 W Mono BTL Audio Amplifier with DC Volume Control TDA7056B 1. Features · DC volume control · Few external components · Mute mode · Thermal protection · Short-circuit proof · No switch-on and switch-off clicks · Good overall stability · Low power consumption · Low HF radiation · ESD protected on all pins. 2. General Description The TDA7056B is a mono Bridge-Tied Load (BTL) output amplifier with DC volume control.
SERVICE MANUAL Dual Operational Amplifier TA75558P The TA75558P, TA75558S and TA75558F are Low-Noise Operational Amplifiers with High Speed and Wide Bandwidth. 1. Features · Internal Frequency Compensation Type · Pin Compatible with TA75558P, TA75558S and TA75558F · Possible to Exchange the Position of 9 Pin for 1 Pin Because of Pin Connection Being Symmetric. (TA75558S Device Only) · Wide Band Range; fT=3MHz(Typ.) · Suitable Application for Active Filter Equalizer Amplifier and Headphone Amplifier. 2.
SERVICE MANUAL Universal Hi-Fi Audio Processor for TV TDA9859 externally ·Two general purpose logic output ports ·I2C-bus control of all functions. 1. Features ·Multi-source selector switches six AF inputs (three stereo sources or six mono sources). ·Each of the input signals can be switched to each of the outputs (crossbar switch). ·Outputs for loudspeaker channel and peri-TV connector (SCART). ·Switchable spatial stereo and pseudo stereo effects ·Audio surround decoder can be added 2.
SERVICE MANUAL TDA9178 YUV One Chip Picture Improvement Based on Luminance Vector-, Color Vector- and Spectral Processor ratio of the most important parts of the scene will be improved. Black restoration is available in the event of a set-up in the luminance signal. 1.
SERVICE MANUAL of coring according to the video level with the video dependent coring. The TDA9178 is also capable to give extra sharpness in the cases of saturated red and magenta parts of the screen using the color dependent sharpness feature. separate pin) is available that detects when the picture content has been changed significantly, called cue flash. An embedded 6-bit ADC can be used for interfacing three analog low frequency voltage signals (e.g.
SERVICE MANUAL 3． Block Diagram Fig.
SERVICE MANUAL Service Data of Key IC’s Table 12 Functions and Service Data of TDA4605(N811)’s Pins Pin No. 1 Digital Multimeter Function Description Reference Voltage (V) 0.4 Regulation control Positive Resistance (KΩ) 0.713 Negative Resistance (KΩ) 0.4 2 Primary current input 1.34 9.71 1.34 3 4 5 Primary voltage monitoring input Ground Drive pulse output 1.91 0 4.08 7.09 0 0.84 1.91 0 4.08 6 7 Supply voltage Soft-start 0.74 2.36 16.35 8.69 4.9 6.
SERVICE MANUAL No. 29 Reference Voltage (V) 4.8 Positive Resistance (20KΩ) 1300 Negative Resistance (20KΩ) 1000 OSC2 30 TEST 0 0 0 31 32 XIN XOUT 1.7 1.5 1500 1500 1100 1100 33 34 RESET VCC 4.8 4.8 12.2 3.4 12.1 3.4 35 36 37 P/N RMT GND 0 4.8 0 1500 20.4 0 1100 20 0 38 39 MUTE W/R 4.8 3 25.7 25.7 25.6 25.6 40 41 SCL SDA 3.5 3.5 6.8 6.8 6.8 6.8 42 STANDBY 0 8.2 8.1 Table 14 Functions and Service Data of AT24C08-10P (N002)’s Pins Pin No.
SERVICE MANUAL 15 Audio signal output 401 8.74 5.96 16 Decoupling capacitor connection 0.02 ∞ ∞ 17 Video input 3.35 8.65 5.88 18 Black current control input 5.87 8.73 5.81 19 Blue (B) signal output 2.36 5.74 5.08 20 Green (G) signal output 2.41 5.74 5.08 21 Red (R) signal output 2.39 5.74 5.08 22 Beam current control 1.77 7.87 5.84 23 Red (R) signal input 3.62 8.61 5.95 24 Green (G) signal input 3.63 8.61 5.95 25 Blue (B) signal input 3.61 8.61 5.
SERVICE MANUAL Table 16 Functions and Service Data of TDA8350Q-N6 (N401)’s Pins Pin No. Function Description Reference Voltage (V) Digital Multimeter Positive Resistance (20KΩ) Negative Resistance (20KΩ) 1 Vertical drive input (positive) 2.33 8.82 5.8 2 Vertical drive input (negative) 2.28 8.83 5.83 3 Feedback input 8.52 5.74 4.71 4 Supply voltage 17.23 7.92 4.2 5 Output 1 8.5 5.83 4.71 6 Not connected 0.00 ∞ ∞ 7 Ground 0.00 0.00 0.00 8 Pump supply voltage input 49.
SERVICE MANUAL Table 18 Functions and Service Data of TDA6108JF/TDA6107Q’s Pins Pin No. Function Description Digital Multimeter Reference Voltage (V) Positive Resistance (20KΩ) Negative Resistance (20KΩ) 1 G inverting input 3.33 5.32 4.72 2 R inverting input 3.26 5.32 4.72 3 B inverting input 3.28 5.32 4.72 4 Ground 0.00 0.00 0.00 5 Black level current input 6.03 18.65 5.65 6 Supply voltage 199 ∞ 4.48 7 B output 69.9 ∞ 5.45 8 R output 69.18 ∞ 5.
SERVICE MANUAL Table 20 Functions and Service Data of HEF4053 (DS01/02/NP02)’s Pins Pin No. Function Description Digital Multimeter Reference Voltage (V) 0 0 Positive Resistance (KΩ) 9.81 0 Negative Resistance (KΩ) 6.15 0 1 2 Signal input Signal input 3 4 Signal input Signal output 0 0 9.81 6.66 6.15 6.21 5 6 Signal input Ground 0 0 0 0 0 0 7 8 Ground Ground 0 0 0 0 0 0 9 10 Control signal input Control signal input 0.12 0.12 7.97 7.99 5.7 5.
SERVICE MANUAL Table 23 Functions and Service Data of TDA9859 (N606)’s Pins Pin No.
SERVICE MANUAL Waveforms of Key ICs Note: The TV receives NTSC color bar with 1KHz sine wave audio reception in Normal mode when measuring voltage and resistance with a GDM-8145 multimeter (Max. resistance: 20 KΩ, Max. DC voltage :20V).
SERVICE MANUAL 47
SERVICE MANUAL 48
SERVICE MANUAL N606’s Pin3, Pin5, Pin7, Pin9 and Pin10 N606’s Pin11, Pin12, Pin19, Pin21 and Pin22 N606’s Pin14 49
SERVICE MANUAL REPLACEMENT OF PARTS 1. Description Many electrical and mechanical components in this chassis have special safety-related characteristics. Components which have these special safety characteristics in this manual and its supplements are identified by the international hazard symbols or UL, FCC, FDA or VDE marking on the circuit diagram and parts list. When replacing any of these components, substitute the one which has the same safety characteristics as specified in the manual.
